CN105797540A - Method for absorbing exhaust from chlorobenzotrifluoride synthesis - Google Patents
Method for absorbing exhaust from chlorobenzotrifluoride synthesis Download PDFInfo
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- CN105797540A CN105797540A CN201410825195.3A CN201410825195A CN105797540A CN 105797540 A CN105797540 A CN 105797540A CN 201410825195 A CN201410825195 A CN 201410825195A CN 105797540 A CN105797540 A CN 105797540A
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Abstract
The present invention relates to the field of energy saving and emission reduction, and particularly relates to a method for absorbing exhaust from chlorobenzotrifluoride synthesis. A reactor is included, and the invention is characterized by further comprising a hydrogen fluoride absorption cell, a hydrogen chloride absorption cell and an alkali cell. The reactor is connected to the hydrogen fluoride absorption cell, hydrogen chloride absorption cell and alkali cell in turn by pipes. A hydrogen fluoride absorption cell is used to absorb all the hydrogen fluoride gas in the exhaust; a sodium hydrogen chloride solution in the hydrogen chloride absorption cell is used for the absorption of hydrogen chloride, and finally an alkali solution is used for the absorption of chlorine, so as to absorb all polluting gases in the exhaust and completely reach the effects of energy saving and emission reduction. The method is easy to use, simple fir operation, low in cost and practical.
Description
Technical field
Patent of the present invention relates to energy-saving and emission-reduction field, is specifically related to a kind of tail gas absorption method for p-chloro benzo trifluoride-99 synthesis.
Background technology
P-chloro benzo trifluoride-99, has another name called 4-Chlorobenzotrifluoride, 4-Chlorobenzotrifluoride, 4-Chlorobenzotrifluoride, is called for short PCBTF.P-chloro benzo trifluoride-99 is important organic synthesis intermediate, it is possible to be used for synthesizing a series of fluoro-containing pesticide, such as Insecticides (tech) & Herbicides (tech).Fluorine-containing aromatic hydrocarbons may also be used for the medical drugs of synthesis tranquillizer, diuretic.It addition, some fluorine-containing aromatic hydrocarbons is applied to dyeing, so that it is bright and lustrous.
The commonly used chlorination fluoride process of synthesis technique of current domestic p-chloro benzo trifluoride-99.In this technical process, chlorination is the bottleneck of this technique.Therefore suitable process route is selected to be particularly important.P-chlorotrichlormethyl is prepared for raw material through chlorination process with parachlorotoluene.This method is divided into Light chlorimation, catalytic chlorination process two kinds.But both approaches all cuts both ways.
1. light chlorination process: adopt irradiation under ultraviolet ray chlorine, produces chlorine radical, and chlorine radical causes chlorination reaction to carry out further.This method will not introduce exogenous impurity to system.But it is relatively inefficient.
2. catalytic chlorination process: adopting and add initiator method generation chlorine radical, then complete chlorination reaction, this method efficiency is higher, but owing to the decomposition of initiator can produce exogenous impurity.
The preparation method disclosing again p-chloro benzo trifluoride-99 at present, including step: parachlorotoluene is entered in reaction unit by (1), evacuation of air, after intensification, pass into chlorine, it is subsequently adding initiator suspension, course of reaction continues interval and adds initiator suspension；Stop logical chlorine when dichloromethyl parachlorotoluene content is down to 0.5wt%, emptying chlorine obtains p-chlorotrichlormethyl；(2) p-chlorotrichlormethyl that step (1) prepares is entered in reactor, add fluohydric acid gas liquid, heat up, start to keep constant voltage when pressure reaches 2.2-2.7MPa, start to keep constant temperature, cooling, pressure release after insulation 50-60min when temperature reaches 90-105 DEG C, after being down to normal temperature and pressure, again add fluohydric acid gas, repeat above reaction until reaction terminates, obtain p-chloro benzo trifluoride-99.But.
Patent of invention content
The purpose of patent of the present invention is in that the defect for prior art and deficiency, a kind of simple in construction is provided, a kind of tail gas absorption method for p-chloro benzo trifluoride-99 synthesis reasonable in design, easy to use, it adopts fluohydric acid gas absorption cell all to be absorbed by the hydrogen fluoride gas in waste gas, adopt in hydrogen chloride absorption pond please sodium chloride solution absorbing hydrogen chloride, finally adopt alkali liquor absorption chlorine, dusty gas in waste gas is all absorbed, it is fully achieved the effect of energy-saving and emission-reduction, it has easy to use, simple to operate, with low cost, practicality is good.
For achieving the above object, patent of the present invention the technical scheme is that
A kind of tail gas absorption method for p-chloro benzo trifluoride-99 synthesis described in patent of the present invention, including reactor, it is characterized in that it also includes fluohydric acid gas absorption cell, hydrogen chloride absorption pond and alkali pond, described reactor pipeline successively connects fluohydric acid gas absorption cell, hydrogen chloride absorption pond and alkali pond.
Further, described fluohydric acid gas absorption cell includes gaseous mixture air inlet pipe, gaseous mixture escape pipe, supersaturation calcium chloride solution, backflow water pipe, water pump and filter membrane, described gaseous mixture air inlet pipe adopts the stainless steel tube of inner liner polytetrafluoroethylene, and described backflow water pipe, water pump and filter membrane form waterway circulating bottom fluohydric acid gas absorption cell.
Further, described hydrogen chloride absorption pond is built with saturated nacl aqueous solution.
Further, described alkali pond is built with sodium hydroxide solution.
After adopting said structure, patent of the present invention has the beneficial effect that patent of the present invention, and it adopts fluohydric acid gas absorption cell all to be absorbed by the hydrogen fluoride gas in waste gas, adopt in hydrogen chloride absorption pond please sodium chloride solution absorbing hydrogen chloride, finally adopt alkali liquor absorption chlorine, the dusty gas in waste gas is all absorbed, is fully achieved the effect of energy-saving and emission-reduction, it has easy to use, simple to operate, with low cost, practicality is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of patent of the present invention；
Fig. 2 is fluohydric acid gas absorption cell schematic diagram.
Description of reference numerals:
1, reactor；2, fluohydric acid gas absorption cell；2-1, gaseous mixture air inlet pipe；2-2, gaseous mixture escape pipe；2-3 supersaturation calcium chloride solution；2-4, backflow water pipe；2-5, water pump；2-6, filter membrane；3, hydrogen chloride absorption pond；4, alkali pond.
Detailed description of the invention
Below in conjunction with accompanying drawing, patent of the present invention is further described.
As depicted in figs. 1 and 2, a kind of tail gas absorption method for p-chloro benzo trifluoride-99 synthesis described in patent of the present invention, including reactor 1, it is characterized in that it also includes fluohydric acid gas absorption cell 2, hydrogen chloride absorption pond 3 and alkali pond 4, described reactor 1 pipeline successively connects fluohydric acid gas absorption cell 2, hydrogen chloride absorption pond 3 and alkali pond 4.
Further, described fluohydric acid gas absorption cell 2 includes gaseous mixture air inlet pipe 2-1, gaseous mixture escape pipe 2-2, supersaturation calcium chloride solution 2-3, backflow water pipe 2-4, water pump 2-5 and filter membrane 2-6, described gaseous mixture air inlet pipe 2-1 adopts the stainless steel tube of inner liner polytetrafluoroethylene, and described backflow water pipe 2-4, water pump 2-5 and filter membrane 2-6 form waterway circulating bottom fluohydric acid gas absorption cell 2.
Further, described hydrogen chloride absorption pond 3 is built with saturated nacl aqueous solution.
Further, described alkali pond 4 is built with sodium hydroxide solution.
Patent of the present invention is in use, waste gas passes sequentially through fluohydric acid gas absorption cell, hydrogen chloride absorption pond and alkali pond, fluohydric acid gas absorption cell is adopted all to be absorbed by the hydrogen fluoride gas in waste gas, adopt in hydrogen chloride absorption pond please sodium chloride solution absorbing hydrogen chloride, finally adopt alkali liquor absorption chlorine, meanwhile, open water pump, bottom fluohydric acid gas absorption cell, form waterway circulating, remove precipitation by filter membrane in time.
Hydrogen fluoride gas in waste gas is all absorbed by its employing fluohydric acid gas absorption cell of patent of the present invention, adopt in hydrogen chloride absorption pond please sodium chloride solution absorbing hydrogen chloride, finally adopt alkali liquor absorption chlorine, dusty gas in waste gas is all absorbed, being fully achieved the effect of energy-saving and emission-reduction, it has easy to use, simple to operate, with low cost, practicality is good.
The above is only the better embodiment of patent of the present invention, therefore all equivalences done according to the structure described in patent application range of the present invention, feature and principle change or modify, and are all included in patent application range of the present invention.
Claims (4)
1. the tail gas absorption method for p-chloro benzo trifluoride-99 synthesis, including reactor (1), it is characterized in that it also includes fluohydric acid gas absorption cell (2), hydrogen chloride absorption pond (3) and alkali pond (4), described reactor (1) pipeline successively connects fluohydric acid gas absorption cell (2), hydrogen chloride absorption pond (3) and alkali pond (4).
2. a kind of tail gas absorption method for p-chloro benzo trifluoride-99 synthesis according to claim 1, it is characterized in that: described fluohydric acid gas absorption cell (2) includes gaseous mixture air inlet pipe (2-1), gaseous mixture escape pipe (2-2), supersaturation calcium chloride solution (2-3), backflow water pipe (2-4), water pump (2-5) and filter membrane (2-6), described gaseous mixture air inlet pipe (2-1) adopts the stainless steel tube of inner liner polytetrafluoroethylene, and described backflow water pipe (2-4), water pump (2-5) and filter membrane (2-6) form waterway circulating in fluohydric acid gas absorption cell (2) bottom.
3. a kind of tail gas absorption method for p-chloro benzo trifluoride-99 synthesis according to claim 1, it is characterised in that: described hydrogen chloride absorption pond (3) is built with saturated nacl aqueous solution.
4. a kind of tail gas absorption method for p-chloro benzo trifluoride-99 synthesis according to claim 1, it is characterised in that: described alkali pond (4) is built with sodium hydroxide solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410825195.3A CN105797540A (en) | 2014-12-27 | 2014-12-27 | Method for absorbing exhaust from chlorobenzotrifluoride synthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410825195.3A CN105797540A (en) | 2014-12-27 | 2014-12-27 | Method for absorbing exhaust from chlorobenzotrifluoride synthesis |
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| CN105797540A true CN105797540A (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410825195.3A Pending CN105797540A (en) | 2014-12-27 | 2014-12-27 | Method for absorbing exhaust from chlorobenzotrifluoride synthesis |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812436A (en) * | 2017-10-30 | 2018-03-20 | 安徽东至广信农化有限公司 | A kind of tail gas treatment process of dichloromethane synthesis |
| CN110817924A (en) * | 2019-10-09 | 2020-02-21 | 江西理工大学 | Method for treating fluorine-containing waste gas |
| CN110841446A (en) * | 2019-10-09 | 2020-02-28 | 江西理工大学 | Method for treating waste gas containing fluorine and chlorine |
Citations (7)
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| US4299606A (en) * | 1976-12-30 | 1981-11-10 | Hooker Chemicals & Plastics Corp. | Recovery of HF and HCl from gaseous mixtures thereof |
| CN102874756A (en) * | 2012-09-24 | 2013-01-16 | 巨化集团技术中心 | Method for removing hydrogen fluoride from hydrogen chloride gas |
| CN102895868A (en) * | 2011-07-28 | 2013-01-30 | 深圳市格林美高新技术股份有限公司 | Method for catalytic hydrolysis of freon and device thereof |
| CN102910664A (en) * | 2012-11-06 | 2013-02-06 | 浙江大学 | Method for recovering fluoride ions in freon by-product mixed acid |
| CN203346070U (en) * | 2012-12-31 | 2013-12-18 | 江苏梅兰化工有限公司 | Device for removing hydrogen fluoride in by-product hydrogen chloride in fluorine chemical engineering |
| CN103848522A (en) * | 2014-03-26 | 2014-06-11 | 南京大学环境规划设计研究院有限公司 | Method for treating fluorine-containing wastewater and recycling fluorine-containing sludge produced by treatment of fluorine-containing wastewater |
| CN104030254A (en) * | 2014-06-12 | 2014-09-10 | 白银有色集团股份有限公司 | Fluorine-chlorine removal and recovery device in copper smelting smoke acid making system and recovery method thereof |
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2014
- 2014-12-27 CN CN201410825195.3A patent/CN105797540A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4299606A (en) * | 1976-12-30 | 1981-11-10 | Hooker Chemicals & Plastics Corp. | Recovery of HF and HCl from gaseous mixtures thereof |
| CN102895868A (en) * | 2011-07-28 | 2013-01-30 | 深圳市格林美高新技术股份有限公司 | Method for catalytic hydrolysis of freon and device thereof |
| CN102874756A (en) * | 2012-09-24 | 2013-01-16 | 巨化集团技术中心 | Method for removing hydrogen fluoride from hydrogen chloride gas |
| CN102910664A (en) * | 2012-11-06 | 2013-02-06 | 浙江大学 | Method for recovering fluoride ions in freon by-product mixed acid |
| CN203346070U (en) * | 2012-12-31 | 2013-12-18 | 江苏梅兰化工有限公司 | Device for removing hydrogen fluoride in by-product hydrogen chloride in fluorine chemical engineering |
| CN103848522A (en) * | 2014-03-26 | 2014-06-11 | 南京大学环境规划设计研究院有限公司 | Method for treating fluorine-containing wastewater and recycling fluorine-containing sludge produced by treatment of fluorine-containing wastewater |
| CN104030254A (en) * | 2014-06-12 | 2014-09-10 | 白银有色集团股份有限公司 | Fluorine-chlorine removal and recovery device in copper smelting smoke acid making system and recovery method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812436A (en) * | 2017-10-30 | 2018-03-20 | 安徽东至广信农化有限公司 | A kind of tail gas treatment process of dichloromethane synthesis |
| CN110817924A (en) * | 2019-10-09 | 2020-02-21 | 江西理工大学 | Method for treating fluorine-containing waste gas |
| CN110841446A (en) * | 2019-10-09 | 2020-02-28 | 江西理工大学 | Method for treating waste gas containing fluorine and chlorine |
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Application publication date: 20160727 |